woodie wrote:
This is a brand new machine - it came out today-
When I owned a G5 they advised against unequal RAM.
It threw off the G5 and slowed down the computer.
DMS Memory has the two - 4GB RAM for a lot lot less then Apple.
If I buy from apple they will keep the two- 2GB RAM, so I will only have the two RAM chips I upgraded to.
If I buy the extra 2-4GB independent from Apple I will have 4 RAM chips, not just two RAM chips.
The RAM management has changed since the days you purchased the G%. That used to be true but now what I told you is true. As long as the RAM is installed in a matched pair, you will get the full speed of the RAM for that pair; if you have two pairs of RAM, each pair need not be identical.
If you buy from Apple in the page where you configure your iMac, you have a radio button to select 4 GB or 8 GB or 16 GB and you are correct that then they keep the original 4 GB of RAM (of course they credit you with the price of the RAM they keep). But to get 12 GB in total, just leave the configuration ordered at 4 GB and then add to your order by buying the additional 8 GB RAM from the Apple Store memory page:
http://store.apple.com/ca/memorymodel/ME_IMAC_S11_27